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Action Potential

A nerve fiber...

Question

A nerve fiber during resting stage is ______________.

A

more permeable to Na+

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B

more permeable to K+

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C

equally permeable for Na+ and K+

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D

less permeable to K+.

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Solution

The correct option is D more permeable to K+
When a neuron is not conducting any impulse, i.e. resting, the axonal membrane is comparatively more permeable to potassium ions (K+) ions and nearly Impermeable to sodium ions (Na+).

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Similar questions

Q. If a part of an axonal membrane becomes more permeable to

{Na}^{+}

ions, the membrane becomes .

Q. Nerve impulses are initiated by nerve fibres only when the membrane shall become more permeable to

The axon shows enhanced permeability to ${N a}^{+}$ after stimulation, leading to ___

Q. Read the following statement (a-d)
(a) Neurons are excitable cells because their membranes are in a polarised state.
(b) Ion channels are completely permeable of different ions.
(c) Axolemma is less permeable to

K^{+}

ions in resting stage.
(d) Axolemma is impermeable to negatively charged proteins in axoplasm.
How many of above statement are wrong?

Q. Antiport transport occurs in the axoplasm of neuron, when neuron is under resting stage. As action potential generates at axon there is a change in pump proteins of axolemma which is about

- 70 mV

and will reach to

- 60 mV

. This will cause opening of

N a^{+}

VGC because it is permeable for uptake of

N a^{+}

ion however it cannot easily diffuse

K^{+}

ion.

Mark the correct statement according to the given paragraph.

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